java键值对的字典序排序 java字典取值

public class MapUrl {
	
	public static  String Check(String key)
	{
		String url;
		
		//创建key和value都是string类型的字典
		Map<String,String> dict = new HashMap<>();
		
		//存值
		dict.put("CALL0001","http://localhost:8080/call");
		dict.put("STOP0002","http://localhost:8080/stop");

		//首先判要查询的key是否存在
		if(dict.containsKey(key))
		{
			//存在的话，取value值
			url = dict.get(key);
		}
		else
		{
			url="the url is not exist";
		}
		return url;
	}
	

	public static void main(String[] args) {
		
		String geturl = Check("CALL0001");	//字典取url
		
	}



}